1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
timofeeve [1]
3 years ago
14

I cant solve this problem, and our teacher said that this would be in the test we'll have tomorrow, can someone help me?

Physics
1 answer:
Ad libitum [116K]3 years ago
3 0

Answer:

d = 11.1 m

Explanation:

Since the inclined plane is frictionless, this is just a simple application of the conservation law of energy:

\frac{1}{2} m {v}^{2}  = mgh

Let d be the displacement along the inclined plane. Note that the height h in terms of d and the angle is as follows:

\sin(15)  =  \frac{h}{d}  \\ or \: h = d \sin(15)

Plugging this into the energy conservation equation and cancelling m, we get

{v}^{2}  = 2gd \sin(15)

Solving for d,

d =  \frac{ {v}^{2} }{2g \sin(15) }  =  \frac{ {(7.5 \:  \frac{m}{s}) }^{2} }{2(9.8 \:  \frac{m}{ {s}^{2} })(0.259)}   \\ = 11.1 \: m

You might be interested in
Describe the energy transformation in a flashlight
anastassius [24]

Answer: When the flashlight is turned on, the chemical energy stored in batteries is converted into electrical energy that flows through wires of flashlight. This electrical energy is then transformed into light and heat energies.

Explanation:

4 0
3 years ago
Put the following words in order from smallest to largest: atoms, matter, elements
WINSTONCH [101]

Answer:

Matter, atoms, elements.

Explanation:

Matter is just a name for anything that has mass and takes up space. Therefore, atoms are larger than matter. Atoms are the smallest bits of an element that <em>are</em><em> </em><em>still</em><em> </em><em>that</em><em> </em><em>element</em>, so, elements would be bigger than the atoms that come together to create them!

Hope this helps!

6 0
2 years ago
Who was the first known contributor to the atomic theory? Select one: a. Thomson b. Bohr c. Dalton d. Democritus
ser-zykov [4K]
It would be D Democritus
He contributed in around 460-370 BC
Whereas the others contributed much later from around 1700's - 1900's
6 0
3 years ago
Which type of galaxy is a spherical cluster of stars with extraordinary brightness and little dust and gas?
Elis [28]

Answer:

Elliptical galaxies

Explanation:

Edwin Hubble classified galaxies into three categories

Elliptical

Spiral

Lenticular

The elliptical galaxies have an elipsoidal shape roughly. They have stars which are old and the primary light source of the galaxy. The formation of new stars is very limited. This increases the brightness of the galaxy. The mass of the stars are low. So, far the percentage elliptical galaxies is low compared to other galaxies.

3 0
3 years ago
Read 2 more answers
Consider a 40,000 km steel pipe in the shape of a ring that fits snuggly all around the circumference of the Earth. We are heati
Tatiana [17]

Answer:

The Height is  H = 70.02 m

Explanation:

We are given that the

                         Initial length is  = 40000\ Km = 40,000 *10^{3} m

from what we are told in the question the circumference of the circle is = 40,000 Km

  This means that the Radius would be :

         Let C denote the circumference

      So  

               C = 2 \pi r

      =>     r = \frac{C}{2 \pi}

               r = \frac{40,000}{2 \pi } = \frac{40,000*10^{3}}{2 *3.142}  = 6.365*10^6 m

We are told that 1-meter bar of steel that increases its temperature by 1 degree C will expand 11*10^{-6} meters

Hence

       The final length would be

                            40000*10^3 *(T + \alpha  )

Where T is the change in  temperature  \alpha is the Coefficient of linear expansion for steel

  let L_{final} denote the final length

   So

        L_{final} =40000*10^{6} *[1+ 11*10^{-6}]

                  = 40000440 \ m

 Now the Height is mathematically represented as

         Height(H) \ = \frac{change \ in \ radius \ }{2 \pi}

                       = \frac{(40000440-40000*10^3)}{2*3.142}

                       = 70.02m

3 0
3 years ago
Other questions:
  • If a person travels at a velocity of 4 m/s for 10 seconds what will be the displacement?
    7·1 answer
  • 1. Take the speed at which the body moves as 10 m/s 2. Calculate the distance travelled by the body every second 3. Take the tim
    10·1 answer
  • Calculate the normal force of a 1,200 kg boulder resting on the ground
    6·2 answers
  • Doubling an object’s height will have what effect on its potential energy due to gravity?
    11·1 answer
  • Which is evidence that a convergent boundary once existed
    8·1 answer
  • When the top right-hand capacitor is filled with a material of dielectric constant κ, the charge on this capacitor is increases
    14·2 answers
  • 1. Simplify the following expression<br> 8-6/4-12+3^2
    6·1 answer
  • Suppose you and your bicycle have a total mass of 70 kg. You are moving at 10 m/s. How much kinetic do you and the bicycle have?
    7·1 answer
  • (DESPERATE WILL GIVE BRAINLIST AND THANKS PLZ HURRY)
    14·2 answers
  • Which has more mass - a 5-kg bag of feathers or a 5-kg<br> cannon ball?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!